Arnold Robbins - Effective awk Programming: Universal Text Processing and Pattern Matching
Here you can read online Arnold Robbins - Effective awk Programming: Universal Text Processing and Pattern Matching full text of the book (entire story) in english for free. Download pdf and epub, get meaning, cover and reviews about this ebook. year: 2015, publisher: OReilly Media, genre: Detective and thriller. Description of the work, (preface) as well as reviews are available. Best literature library LitArk.com created for fans of good reading and offers a wide selection of genres:
Romance novel
Science fiction
Adventure
Detective
Science
History
Home and family
Prose
Art
Politics
Computer
Non-fiction
Religion
Business
Children
Humor
Choose a favorite category and find really read worthwhile books. Enjoy immersion in the world of imagination, feel the emotions of the characters or learn something new for yourself, make an fascinating discovery.
- Book:Effective awk Programming: Universal Text Processing and Pattern Matching
- Author:
- Publisher:OReilly Media
- Genre:
- Year:2015
- Rating:3 / 5
- Favourites:Add to favourites
- Your mark:
Effective awk Programming: Universal Text Processing and Pattern Matching: summary, description and annotation
We offer to read an annotation, description, summary or preface (depends on what the author of the book "Effective awk Programming: Universal Text Processing and Pattern Matching" wrote himself). If you haven't found the necessary information about the book — write in the comments, we will try to find it.
When processing text files, the awk language is ideal for handling data extraction, reporting, and data-reformatting jobs. This practical guide serves as both a reference and tutorial for POSIX-standard awk and for the GNU implementation, called gawk. This book is useful for novices and awk experts alike.
In this thoroughly revised edition, author and gawk lead developer Arnold Robbins describes the awk language and gawk program in detail, shows you how to use awk and gawk for problem solving, and then dives into specific features of gawk. System administrators, programmers, webmasters, and other power users will find everything they need to know about awk and gawk. You will learn how to:
- Format text and use regular expressions in awk and gawk
- Process data using awks operators and built-in functions
- Manage data relationships using associative arrays
- Define your own functions
- Think in awk with two full chapters of sample functions and programs
- Take advantage of gawks many advanced features
- Debug awk programs with the gawk built-in debugger
- Extend gawk by writing new functions in C or C++
This book is published under the terms of the GNU Free Documentation License. You have the freedom to copy and modify this GNU manual.
Royalties from the sales of this book go to the Free Software Foundation and to the author.
Arnold Robbins: author's other books
Who wrote Effective awk Programming: Universal Text Processing and Pattern Matching? Find out the surname, the name of the author of the book and a list of all author's works by series.
Effective awk Programming: Universal Text Processing and Pattern Matching — read online for free the complete book (whole text) full work
Below is the text of the book, divided by pages. System saving the place of the last page read, allows you to conveniently read the book "Effective awk Programming: Universal Text Processing and Pattern Matching" online for free, without having to search again every time where you left off. Put a bookmark, and you can go to the page where you finished reading at any time.
Font size:
Interval:
Bookmark:
EffectiveawkProgrammingArnoldRobbins Tomyparents,fortheirlove,andforthewonderfulexampletheysetforme. TomywifeMiriam,formakingmecomplete.Thankyouforbuildingyourlifetogether withme. ToourchildrenChana,Rivka,Nachum,andMalka,forenricheningourlivesin innumerableways. ForewordtotheThirdEditionMichaelBrennan Authorofmawk ArnoldRobbinsandIaregoodfriends.Wewereintroducedin1990bycircumstances andourfavoriteprogramminglanguage,awk.Thecircumstancesstartedacoupleofyears earlier.IwasworkingatanewjobandnoticedanunpluggedUnixcomputersittinginthe corner.Nooneknewhowtouseit,andneitherdidI.However,acoupleofdayslater,it wasrunning,andIwasrootandtheone-and-onlyuser.Thatday,Ibeganthetransition fromstatisticiantoUnixprogrammer. OnoneofmanytripstothelibraryorbookstoreinsearchofbooksonUnix,Ifoundthe grayawkbook,a.k.a.AlfredV.Aho,BrianW.Kernighan,andPeterJ.Weinbergers TheAWKProgrammingLanguage(Addison-Wesley,1988).awkssimpleprogramming paradigmfindapatternintheinputandthenperformanactionoftenreduced complexortediousdatamanipulationstoafewlinesofcode.Iwasexcitedtotrymyhand atprogramminginawk. (Incidentally,itsnolongerdifficulttofindanewawk.gawkshipswithGNU/Linux,and youcandownloadbinariesorsourcecodeforalmostanysystem;mywifeusesgawkon herVMSbox.) MyUnixsystemstartedoutunpluggedfromthewall;itcertainlywasnotpluggedintoa network.So,oblivioustotheexistenceofgawkandtheUnixcommunityingeneral,and desiringanewawk,Iwrotemyown,calledmawk.BeforeIwasfinished,Iknewabout gawk,butitwastoolatetostop,soIeventuallypostedtoacomp.sourcesnewsgroup. (Incidentally,itsnolongerdifficulttofindanewawk.gawkshipswithGNU/Linux,and youcandownloadbinariesorsourcecodeforalmostanysystem;mywifeusesgawkon herVMSbox.) MyUnixsystemstartedoutunpluggedfromthewall;itcertainlywasnotpluggedintoa network.So,oblivioustotheexistenceofgawkandtheUnixcommunityingeneral,and desiringanewawk,Iwrotemyown,calledmawk.BeforeIwasfinished,Iknewabout gawk,butitwastoolatetostop,soIeventuallypostedtoacomp.sourcesnewsgroup.
Afewdaysaftermyposting,IgotafriendlyemailfromArnoldintroducinghimself.He suggestedwesharedesignandalgorithmsandattachedadraftofthePOSIXstandardso thatIcouldupdatemawktosupportlanguageextensionsaddedafterpublicationof TheAWKProgrammingLanguage. Frankly,ifourroleshadbeenreversed,Iwouldnothavebeensoopenandweprobably wouldhavenevermet.Imgladwedidmeet.Heisanawkexpertsawkexpertanda genuinelyniceperson.Arnoldcontributessignificantamountsofhisexpertiseandtimeto theFreeSoftwareFoundation. Thisbookisthegawkreferencemanual,butatitscoreitisabookaboutawkprogramming thatwillappealtoawideaudience.Itisadefinitivereferencetotheawklanguageas definedbythe1987BellLaboratoriesreleaseandcodifiedinthe1992POSIXUtilities standard. Ontheotherhand,thenoviceawkprogrammercanstudyawealthofpracticalprograms thatemphasizethepowerofawksbasicidioms:data-drivencontrolflow,patternmatching withregularexpressions,andassociativearrays.Thoselookingforsomethingnewcantry outgawksinterfacetonetworkprotocolsviaspecial/inetfiles. Theprogramsinthisbookmakeclearthatanawkprogramistypicallymuchsmallerand fastertodevelopthanacounterpartwritteninC.Consequently,thereisoftenapayoffto prototypinganalgorithmordesigninawktogetitrunningquicklyandexposeproblems early.Often,theinterpretedperformanceisadequateandtheawkprototypebecomesthe product. Thenewpgawk(profilinggawk)producesprogramexecutioncounts.Irecently experimentedwithanalgorithmthatfor nlinesofinputexhibited Cn2performance, whiletheorypredicted Cnlognbehavior.Afewminutesporingovertheawkprof.out profilepinpointedtheproblemtoasinglelineofcode.pgawkisawelcomeadditiontomy programmerstoolbox.
Arnoldhasdistilledoveradecadeofexperiencewritingandusingawkprograms,and developinggawk,intothisbook.Ifyouuseawkorwanttolearnhow,thenreadthisbook. ForewordtotheFourthEditionMichaelBrennan Authorofmawk Somethingsdontchange.ThirteenyearsagoIwrote:Ifyouuseawkorwanttolearn how,thenreadthisbook.Truethen,andstilltruetoday. Learningtouseaprogramminglanguageisaboutmorethanmasteringthesyntax.One needstoacquireanunderstandingofhowtousethefeaturesofthelanguagetosolve practicalprogrammingproblems.Afocusofthisbookismanyexamplesthatshowhowto useawk. Somethingsdochange.Ourcomputersaremuchfasterandhavemorememory. Consequently,speedandstorageinefficienciesofahigh-levellanguagematterless. PrototypinginawkandthenrewritinginCforperformancereasonshappensless,because moreoftentheprototypeisfastenough.
Ofcourse,therearecomputingoperationsthatarebestdoneinCorC++.Withgawk4.1 andlater,youdonothavetochoosebetweenwritingyourprograminawkorinC/C++. YoucanwritemostofyourprograminawkandtheaspectsthatrequireC/C++capabilities canbewritteninC/C++,andthenthepiecesgluedtogetherwhenthegawkmoduleloads theC/C++moduleasadynamicplug-in. hasallthedetails,and,asexpected, manyexamplestohelpyoulearntheinsandouts. Ienjoyprogramminginawkandhadfun(re)readingthisbook.Ithinkyouwill,too. PrefaceArnoldRobbins NofAyalon Israel Severalkindsoftasksoccurrepeatedlywhenworkingwithtextfiles.Youmightwantto extractcertainlinesanddiscardtherest.Oryoumayneedtomakechangeswherever certainpatternsappear,butleavetherestofthefilealone.Suchjobsareofteneasywith awk.Theawkutilityinterpretsaspecial-purposeprogramminglanguagethatmakesiteasy tohandlesimpledata-reformattingjobs. TheGNUimplementationofawkiscalledgawk;ifyouinvokeitwiththeproperoptionsor environmentvariables,itisfullycompatiblewiththePOSIX]specificationoftheawk languageandwiththeUnixversionofawkmaintainedbyBrianKernighan.Thismeans thatallproperlywrittenawkprogramsshouldworkwithgawk.Somostofthetime,we dontdistinguishbetweengawkandotherawkimplementations.
Usingawkyoucan: Managesmall,personaldatabases Generatereports Validatedata Produceindexesandperformotherdocument-preparationtasks Experimentwithalgorithmsthatyoucanadaptlatertoothercomputerlanguages Inaddition,gawkprovidesfacilitiesthatmakeiteasyto: Extractbitsandpiecesofdataforprocessing Sortdata Performsimplenetworkcommunications Profileanddebugawkprograms ExtendthelanguagewithfunctionswritteninCorC++ Thisbookteachesyouabouttheawklanguageandhowyoucanuseiteffectively.You shouldalreadybefamiliarwithbasicsystemcommands,suchascatandls, aswellas basicshellfacilities,suchasinput/output(I/O)redirectionandpipes. Implementationsoftheawklanguageareavailableformanydifferentcomputing environments.Thisbook,whiledescribingtheawklanguageingeneral,alsodescribesthe particularimplementationofawkcalledgawk(whichstandsforGNUawk).gawkrunson abroadrangeofUnixsystems,rangingfromIntel-architecturePC-basedcomputersup throughlarge-scalesystems.gawkhasalsobeenportedtoMacOSX,MicrosoftWindows (allversions),andOpenVMS.[] HistoryofawkandgawkRECIPEFORAPROGRAMMINGLANGUAGE 1partegrep 1partsnobol 2partsed 3partsC Blendallpartswellusinglexandyacc.Documentminimallyandrelease. Aftereightyears,addanotherpartegrepandtwomorepartsC.Documentverywellandrelease. Thenameawkcomesfromtheinitialsofitsdesigners:AlfredV.Aho,PeterJ.Weinberger, andBrianW.Kernighan.Theoriginalversionofawkwaswrittenin1977atAT&TBell Laboratories.In1985,anewversionmadetheprogramminglanguagemorepowerful, introducinguser-definedfunctions,multipleinputstreams,andcomputedregular expressions.ThisnewversionbecamewidelyavailablewithUnixSystemVRelease3.1 (1987).TheversioninSystemVRelease4(1989)addedsomenewfeaturesandcleaned upthebehaviorinsomeofthedarkcornersofthelanguage.Thespecificationforawkin thePOSIXCommandLanguageandUtilitiesstandardfurtherclarifiedthelanguage.Both thegawkdesignersandtheoriginalawkdesignersatBellLaboratoriesprovidedfeedback forthePOSIXspecification. PaulRubinwrotegawkin1986.JayFenlasoncompletedit,withadvicefromRichard Stallman.JohnWoodscontributedpartsofthecodeaswell.In1988and1989,David Trueman,withhelpfromme,thoroughlyreworkedgawkforcompatibilitywiththenewer awk.Circa1994,Ibecametheprimarymaintainer.Currentdevelopmentfocusesonbug fixes,performanceimprovements,standardscompliance,and,occasionally,newfeatures. InMay1997,JrgenKahrsfelttheneedfornetworkaccessfromawk,andwithalittle helpfromme,setaboutaddingfeaturestodothisforgawk.Atthattime,healsowrotethe bulkof TCP/IPInternetworkingwithgawk(aseparatedocument,availableaspartofthe gawkdistribution).Hiscodefinallybecamepartofthemaingawkdistributionwithgawk version3.1.
Next pageFont size:
Interval:
Bookmark:
Similar books «Effective awk Programming: Universal Text Processing and Pattern Matching»
Look at similar books to Effective awk Programming: Universal Text Processing and Pattern Matching. We have selected literature similar in name and meaning in the hope of providing readers with more options to find new, interesting, not yet read works.
Discussion, reviews of the book Effective awk Programming: Universal Text Processing and Pattern Matching and just readers' own opinions. Leave your comments, write what you think about the work, its meaning or the main characters. Specify what exactly you liked and what you didn't like, and why you think so.